// Copyright (c) Appeon. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. 
// You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0.

using System;
using System.Linq.Expressions;
using System.Reflection;

namespace SnapObjects.Commons
{
    public static class ExpressionExtensions
    {
        public static PropertyInfo ExtractProperty<T, TProperty>(
            this Expression<Func<T, TProperty>> propertySelector)
        {
            var propertyAccessExpr = propertySelector.Body as MemberExpression;

            if (propertyAccessExpr == null && propertySelector.Body is UnaryExpression convertExpr)
            {
                propertyAccessExpr = convertExpr.Operand as MemberExpression;
            }

            return propertyAccessExpr?.Member as PropertyInfo;
        }
    }
}
